Function createRootEl

packages/core/test/application_ref_spec.ts:72–82

(selector = 'bootstrap-app')

  });

  function createRootEl(selector = 'bootstrap-app') {
    const doc = TestBed.inject(DOCUMENT);
    const rootEl = <HTMLElement>(
      getContent(createTemplate(`<${selector}></${selector}>`)).firstChild
    );
    const oldRoots = doc.querySelectorAll(selector);
    for (let i = 0; i < oldRoots.length; i++) {
      getDOM().remove(oldRoots[i]);
    }
    doc.body.appendChild(rootEl);
  }

  type CreateModuleOptions = {
    providers?: any[];